Insulator



1,640,815 1927' H. p. BROOKMAN INSULATOR Filed Feb. 17, 1922 INVENTOR ATTORNEY Patented Aug. 30, 1 927.

UNITED-STATES PIATEN-THOFFICE.

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Application filed February 17, 191385 801111 No. 587,948.

My invention relates to insulators for su porting electric conductors.

ne object of my invention is to provide a single piece insulator-that shall be relatively inexpensive to manufacture and that shall support and securely hold an electric conductor in a sim le and efiicient manner.

Another object 0 my invention is to provide a single piece insulator that shall be provided with two oppositely disposed lugs so arranged as to be easily positioned to support a stretched electric conductor.

Another object of my invention is to provide an insulator that shall comprise a body portion composed of insulating material and two oppositely disposed lugs projecting from the body portion, the bases of the adjacent end portions of said lugs being cut away for supporting and: holding a conductor between them by a wedging action.

Another object of my invention is to provide an insulator that shall com rise a body rtion having a hole formed A further object of my invention is .to. provide an insulator that "shall comprise a cylindrical body portion having a longitudinal flat, surface formed thereon and two lugs projecting from the flat surface, said lugs having overlapping end portions forming a slot onthe body portion and each of the overlapping end portions being cut away at the base to form a wedge shaped notch with the flat surface on the body portion.

In installing electric conductors it is de- 'sirable to first string and stretch a conductor in position and then securely support and hold it in position by means of insulators. At the present time two-piece insulators are extensively used for supporting and holding conductors. insulators are generally assembled on a fastening member comprising a nail or a screw. The. fastening member is provided with means for holding the two pleces of the insulator in assembled position. Generally a conductor in an efficient manner.

'tion.

Such two-piece the two ieces}: the insulator are held on the fastening member between the head thereof and-.either a washer slidably fas-. tened thereto or wings stamped thereon.

The conductor, which is placed between'the two parts of the insulator, is held in position when the fastening member is driven into a support.

insulator constructed in accordance with m invention consists of a single iece of insu ating material which securely liblds The single piece insulator is not only cheaper to manufacture but: more easily assembled on a fastening member. The insulator preferably comprises-- a body portion composed of porcelain or other insulatin material. The body portion is prefera 1y cylindrical in form ut may bemanufactured in other shapes if so desired" and has-a fiat surface formed "thereon. Two oppositely disposed ln s, whichare preferably formed integral wit the body, portion, project from the flat surface. The lugs have overlapping end portions which form a slot on the flat surface of the body portion. The base. of

each of the overlapping end portions of the lugs is cut awa to form a wed e shaped notch with the at surface of the body portion. The conductor is held in position by the wedging action of the notches on the lugs. The insulator is sitioned on the conductor in a simple an an efiicient man-'- ner to be hereinafter set forth.

In the accompanying drawing:

Figure 1 is an end view of an insulator constructed in accordance 'with my inven- Figs. 2 and 3 are respectively side elevational and front elevational views of the insulator shown in Fig. 1.. H

Fig. 4. is a front elevatibnal view of an insulator secured to a fastening member by means of a washer;

Fig. 5 is a front elevational view of an insulator secured to a fastening member by -means of wings or fins formed thereon.

Figs. 6, 7 and 8- are views showing the connecting of an insulator to an electric conductor.

Referring to Figs: 1, 2 and 3 of the drawing, my insulator com rises a body rtion 1 which is composed 0 an suitable msulating material and refera ly of orcelain. A flat surface 2 is ormed on the bod portion 1 and two oppositely disposed ugs 3 and 4 project from v the flat surface. Theflat surface 2 of the bodyportion. The base of the end portion 6 is cutaway in a similar with the flat surface 2 o The top of the lug 4 is tapered or cut away manner to form a wedgetilshipeld notch 9 e o y porlon.

at 10 for protecting the lug when driving the nail or securin member into a support. Moreover, the apered portion on the lug 4 serves to prevent the lug 4 being destroyed when the die, in which the insulator is pressed, is released.

-A hole 11 is formed in the body portion 1 for the insertion of a securing or fastening member which preferably is either a nail or a screw. The upper end of the 'hole 11 is countersunk at 12 as shown in Figs. 1 and 2 of the drawing. "Preferably, the hole 11 is formed arallel to the flat surface 2. The insulator is formed inan suitable manner and is preferably forme by pressing a porcelain mixture in a die.

Referring to Fig. of the drawing, a securing member in the form of a nail 13 1s shown assembled with the insulator. The nail 13 is inserted in the hole 11 with.a washer 14, preferably composed of leather, inserted between the top of the insulator and the head of. the nail. A suitable washer 15, preferably composed of steel, is inserted on the nail below the insulator. The washer frictionally engages the nail to hold the parts in assembled position. A countersink may be formed for washer 15.

Referring to Fig. 5 of the drawing, an insulator is shown assembled with a nail having fins or projections 16 stamped therein below the insulator. The projections'lfi hold the parts in assembled position. A leather washer is positioned between the head of the nail and the insulator, as in the assembled insulator shown in Fig. 4 of the drawing. If so desired a screw or other securing member may be used in place of a nail.

The positioning of my insulator on an electric conductor is illustrated in Figs. 6, 7 and 8 of the drawing. An electric conductor 17 is assumed to be stretched in the position it is to be firmly held. The assembled insulator is placed on the conductor with.

the conductorin the slot 7 formed by the two lugs 3 and 4, as shown in Fig. 6 of the drawing. The assembled insulator is then moved through 90 to the position shown in Fig. 7 of the drawing. The conductor is held in the wedge shaped notches formed between the lugs 3 and 4 and the flat surface'2. on the body portion 1. The assembled insulator is next rotated throu h 90 in a plane perpendicular to the con uctor 17 to the position shown in Fig. 8 of the drawing.

The fastening member 13 is then driven int insulator serve to hold-a conductor without injuring the insulating covering thereon.

Modifications in the shape and construction of the insulator may be made within the spirit and scope of my invention, and such modifications are intended to be covered by the appended claims. What I claim is:

'1. A porcelain insulator comprising a' body portion having a flat surface formed thereon, lugs pro ecting from the flat surface, and overlapping end portions on said lugs, the base of each overlapping end portion being cut away to form an acute angle with the flat surface on the body portion and also to forman acute angle with a plane perpendicular to said flat surface and parallel to a conductor in normal 4 position between the lugs.

2. An insulator comprising a body portion having a flat surface formed thereon, two

lugs projecting from said flat surface, said lugs having overlapping portions which form a slot in the insulator, the base of the overlappin portion of each lug being cut away for orming not only an acute angle with the fiat surface on the body portion but also for forming an acute angle with a plane which is perpendicular to the flat surface to hold .a conductor against longitudinal movement, and an opening formed in the body portion of the insulator parallel to the flat surface for the insertion of a fastening member.

3. An insulator comprising a cylindrical body ortion having a fiat longitudinal surface ormed thereon, lugs pro'ectin from the flat surface, overlapping en portions on said lugs, the base of each overlapping end portion being cut away to form an acute angle with the flat surface on the body portion and also ,to form an acute angle with a plane perpendicular not only to the fiat surface but also to axis of the cylindrical body portion, and an opening formed in the body portion parallel to said flat surface for the insertion of a fastening member.

In testimony whereof, I hereto afiix my signature.

HORACE D. BROOKMAN. 

